package main

import (
	"fmt"
)

type Books struct {
	title   string
	author  string
	subject string
	book_id int
}

func main() {
	book1 := Books{"Go 语言", "wwww.runoob.com", "Go 语言教程", 6495407}
	fmt.Println(book1)
	book2 := Books{"Go 语言", "wwww.runoob.com", "Go 语言教程", 6495407}
	fmt.Println(book2)
	book3 := Books{title: "Go 语言", author: "www.runoob.com"}
	fmt.Println(book3)
}
